Hi Russell, Will or Nicolas, (In this mail, we only discuss ARM 32-bit linux.)
As we know, the region (0xfff00000-0xfffdffff) is reserved as fixmap mapping region. The function "kmap_atomic" maps highmem pages to this region referring to CPUID and per-cpu variable "__kmap_atomic_idx" via idx = type + KM_TYPE_NR * smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); Size of region used by one cpu is 0x10000 (KM_TYPE_NR << PAGE_SHIFT). And the total size of the fixmap mapping region is 0xe0000. (only support 14 CPUs). So in a system of more than 14 CPUs, this region is not large enough. should we change the memory layout on ARM Linux to support 14+ cpu system ? Or can we do anything else to support that ? Thanks, Liu Hua . -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
